<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>canvas圆</title>
	</head>
	<body>
		<canvas id="myCanvas" width="200" height="100" style="border:1px solid #c3c3c3;">
			
		</canvas>
		<script>
		var c = document.getElementById("myCanvas");
		var ctx = c.getContext("2d");
		ctx.beginPath();
		ctx.arc(95, 50, 40, 0, 2 * Math.PI);
		ctx.stroke();
		</script>
	</body>
</html>